In a monastery cult off from the world, the monks run a clinic for the possessed. One day, a young policeman Marek comes to the convent. Posing as a clergyman, he penetrates monastic life and tries to explain the recent, mysterious disappearance of several tormented inmates. It turns out, however, that there is no way out of the monastery .In 1987 Poland, a police officer investigating mysterious disappearances infiltrates a remote monastery and discovers a dark truth about its clergy.